Razvoj metoda imobilizacije fotokatalizatora na različitim čvrstim nosačima

master's thesis

• Title (english): Development of methods for immobilization of photocatalysts on various solid supports
• Author: Tamara Kopunić
• Mentor: Vanja Kosar (mentor)
• Committee member: Vanja Kosar (predsjednik povjerenstva)
• Committee member: Vesna Tomašić (član povjerenstva)
• Committee member: Mirela Leskovac (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-04-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Idealni pesticidi bi trebali biti štetni samo za ciljane organizme, biorazgradivi, u odgovarajućoj mjeri ekološki prihvatljivi te ne bi smjeli dospijevati u podzemne vode. Međutim, to je rijetko slučaj te široka upotreba pesticida u modernoj poljoprivredi izaziva sve veću zabrinutost. Otpadne vode, koje često sadrže tragove pesticida, podvrgavaju se različitim metodama pročišćavanja. No, uklanjanje pesticida iz otpadnih voda konvencionalnim metodama predstavlja izazov radi njihove visoke stabilnosti. Zbog toga se kao alternativa konvencionalnim metodama sve češće koriste napredni oksidacijski procesi, posebice heterogena fotokataliza. Cilj ovog rada bio je istražiti fotokatalitičku razgradnju neonikotinoidnog insekticida imidakloprida u vodenoj otopini primjenom TiO2 fotokatalizatora vezanih za perlitni nosač. Kao modelna komponenta korišten je imidakloprid, a eksperiment je proveden u čaši koja simulira kotlasti (šaržni) reaktor s recirkulacijom reakcijske smjese.
U eksperimentima je korišten heterogeni fokatalizator, a radi se o UV-C modificiranom TiO2 koji je imobiliziran na granulama perlita. Statistički plan eksperimenta dobiven je pomoću softverskog paketa Design Expert, a ispitan je utjecaj pH, intenziteta zračenja i tipa katalizatora na učinkovitost reakcije. Proces razgradnje imidakloprida bio je praćen primjenom visokoefikasne tekućinske kromatografije. Na temelju prikupljenih eksperimentalnih podataka, izračunate su konverzije fotokatalitičke razgradnje i konstante brzine reakcije, koristeći se Langmuir-Hinshelwoodovim kinetičkim modelom reakcije. Rezultati istraživanja pokazali su da vrsta katalizatora ima značajan utjecaj na konverziju reakcije. Najveća konverzija postignuta je koristeći heterogeni katalizator s perlitnim nosačem veličine čestica 2,5 mm koji je bio podvrgnut metodi impregnacije dvaput, uz najveći intenzitet zračenja te pri teorijski najoptimalnijem pH za fotokatalitičke reakcije.

Abstract (english)

Ideal pesticides should be harmful only to the target organisms, biodegradable, environmentally acceptable to the appropriate extent, and should not reach groundwater. However, this is rarely the case and the widespread use of pesticides in modern agriculture is causing increasing concern. Wastewater, which often contains traces of pesticides, is subjected to various purification methods. However, the removal of pesticides from wastewater using conventional methods is a challenge due to their high stability. This is why advanced oxidation processes, especially heterogeneous photocatalysis, are increasingly being used as an alternative to conventional methods. The aim of this study was to investigate the photocatalytic degradation of the neonicotinoid insecticide imidacloprid in an aqueous solution using a TiO2 photocatalyst attached to a pearlite carrier. Imidacloprid was used as a model component, and the experiment was conducted in a beaker simulating a boiler (batch) reactor with recirculation of the reaction mixture. A heterogeneous focal catalyst was used in the experiments, namely UV-C modified TiO2 immobilized on pearlite granules. Statistical experiment plan obtained using the Design Expert software package, and the influence of pH, radiation intensity and catalyst type on reaction efficiency was tested. The degradation process of imidacloprid was monitored using high-performance liquid chromatography. Based on the collected experimental data, photocatalytic degradation conversions and reaction rate constants were calculated using the Langmuir-Hinshelwood reaction kinetic model. The research results showed that the type of catalyst has a significant influence on the conversion of the reaction. The highest conversion was achieved using a heterogeneous catalyst with a pearlite support with a particle size of 2,5 mm that was subjected to the impregnation method twice, with the highest radiation intensity and at the theoretically most optimal pH for photocatalytic reactions.

• Keywords: pesticidi; neonikotinoidi; imidakloprid; heterogena fotokataliza; perlit; titanijev (IV) oksid; DOE
• Keywords (english): pesticides; neonicotinoids; imidacloprid; heterogeneous photocatalysis; perlite; titanium (IV) oxide; DOE
• Language: croatian
• URN:NBN: urn:nbn:hr:149:263518
• Study programme: Title: Materials Science and Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-05-06 11:44:49